Blue cut lenses, also known as blue light glasses, are designed to limit blue light exposure from digital screens. They are important for people who spend long hours working with screens and are at a higher risk of developing premature eye damage and loss of visual acuity. Blue light is visible light with high energy in the range of 380 nanometers to 495 nanometers, and blue-cut lenses are designed to absorb anywhere from 10% to over 90% of blue light. The filter that is built into the lenses of blue cut glasses ensures that artificial blue light does not reach your eyes. The amount of color distortion may increase with lenses that are designed to block more than 50% or 60% of blue light from passing through to your eyes. Blue cut lenses may feature layered substrates or blue light blocking coatings, depending on the brand. Some blue-light-blocking lenses are infused with melanin, which filters out up to 98% of blue light. Blue cut lenses are different from anti-glare or anti-reflective lens coatings, which permit the full spectrum of visible light to pass through, including blue light, and are designed primarily to improve clarity of vision that could otherwise be diminished by glare, which is most useful for reducing eye strain and enhancing vision.

In summary, blue cut lenses are designed to limit blue light exposure from digital screens and are important for people who spend long hours working with screens. They are different from anti-glare or anti-reflective lens coatings, which permit the full spectrum of visible light to pass through, including blue light, and are designed primarily to improve clarity of vision that could otherwise be diminished by glare.